PredefinedId.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Model\ResourceModel;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\Model\AbstractModel;

trait PredefinedId
{
    protected function isObjectNotNew(AbstractModel $object)
    {
        $connection = $this->getConnection();
        $select = $connection->select()
            ->from($this->getMainTable(), [$this->getIdFieldName()])
            ->where($this->getIdFieldName() . ' = ?', $object->getId())
            ->limit(1);
        return (bool)$connection->fetchOne($select);
    }

    protected function saveNewObject(\Magento\Framework\Model\AbstractModel $object)
    {
        $bind = $this->_prepareDataForSave($object);
        $this->getConnection()->insert($this->getMainTable(), $bind);

        if ($this->_isPkAutoIncrement) {
            $object->setId($this->getConnection()->lastInsertId($this->getMainTable()));
        }

        if ($this->_useIsObjectNew) {
            $object->isObjectNew(false);
        }
    }
}